Seneca Wheel Hub check procedure

[Mark S]

Next on my maintenance list is checking the oil in the hubs. Do I need to pull the wheel covers or can I just pop off the center caps? And do both front and rear wheels have the oil view caps? Thanks.

[Oma/opa]

To check the oil level you only need to remove the center caps and then the rubber cover on the axle. If the oil is low or to take a sample of the oil you need to remove the entire hubcap to access the plug. To sample the oil, Freightliner says position the plug facing the ground and loosen to get a sample. I think I would leave it in the upright position and remove the plug and take a sample with an eyedropper. to add oil, the plug must be in the upright position.

[Mark S]

Thanks Roy. Why would I need to sample the oil?

[Robbbyr]

Originally Posted by Mark S

And do both front and rear wheels have the oil view caps? Thanks.

Hey Mark!
The rear wheel bearings are lubricated by the same oil in the differential, so you just need to check the rear axle oil level. On level ground you remove the plug in the axle housing and the oil level should be at or just below the opening.

[Rustynuts]

Here are the pages from the manual.

[Mark S]

Thank you Rob and Rusty.

[Oma/opa]

Originally Posted by Mark S

Thanks Roy. Why would I need to sample the oil?

Mark ..to check for possible contaminants and or metal. probably not necessary unless you suspect a problem or the oil appears cloudy